Hey Chili, I used Sylvania Gro-Lux 40 watt bulbs. I am sure there are better bulbs out there but they were like $5 each and I have 2 in there (From Menards). It is a wide spectrum bulb and I believe they are 3600 lumens per bulb. So far I haven't had any issues except prior to the fan I had a few young ones die off.